Industrial
CVE-2026-21865
MEDIUM
Severity by source
AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
Lifecycle Timeline
2DescriptionGitHub Advisory
Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, moderators can convert some personal messages to public topics when they shouldn't have access. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. As a workaround, site admin can temporarily revoke the moderation role from untrusted moderators or remove the moderator group from the "personal message enabled groups" site setting until the Discourse instance has been upgraded to a version that has been patched.
AnalysisAI
Discourse versions before 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0 allow moderators with insufficient permissions to convert private messages into public topics, potentially exposing sensitive user communications. The vulnerability affects any Discourse instance where untrusted moderators have access to moderation features. Site administrators can mitigate this by temporarily removing moderator privileges or disabling personal message access for moderator groups until patching to a fixed version.
Technical ContextAI
Classified as CWE-862 (Missing Authorization). Affects Discourse. Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, moderators can convert some personal messages to public topics when they shouldn't have access. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. As a workaround, site admin can temporarily revoke the moderation role from untrusted moderators or remove the moderator group from the "personal message enabled groups" site setting until the Discourse instance ha
RemediationAI
Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.
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External POC / Exploit Code
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